fix: remove default for label baseline

The Vega specification appears to be incorrect here. The baseline
default depends on axis orientation and likely other properties.

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Author: kgryte

lib/node_modules/@stdlib/plot/vega/axis/ctor/lib/defaults.js

@@ -65,9 +65,6 @@ function defaults() {
 		// Boolean indicating whether axis tick labels should be included as part of an axis:
 		'labels': true,
 
-		// Vertical text baseline of axis tick labels:
-		'labelBaseline': 'alphabetic',
-
 		// Boolean indicating whether to hide axis tick labels which exceed the axis range:
 		'labelBound': false,
 

lib/node_modules/@stdlib/plot/vega/axis/ctor/lib/label-baseline/get.js

@@ -31,7 +31,7 @@ var prop = require( './properties.js' );
 * Returns the vertical baseline of axis tick labels.
 *
 * @private
-* @returns {string} vertical baseline
+* @returns {(void|string)} vertical baseline
 */
 function get() {
 	return this[ prop.private ];

lib/node_modules/@stdlib/plot/vega/axis/ctor/lib/label-baseline/set.js

@@ -24,6 +24,7 @@
 
 var logger = require( 'debug' );
 var isVerticalBaseline = require( '@stdlib/plot/vega/base/assert/is-vertical-baseline' );
+var isUndefined = require( '@stdlib/assert/is-undefined' );
 var join = require( '@stdlib/array/base/join' );
 var verticalBaselines = require( '@stdlib/plot/vega/base/vertical-baselines' );
 var format = require( '@stdlib/string/format' );
@@ -42,12 +43,12 @@ var debug = logger( 'vega:axis:set:'+prop.name );
 * Sets the vertical baseline position of axis tick labels.
 *
 * @private
-* @param {string} value - input value
+* @param {(string|void)} value - input value
 * @throws {TypeError} must be a valid vertical baseline
 * @returns {void}
 */
 function set( value ) {
-	if ( !isVerticalBaseline( value ) ) {
+	if ( !isVerticalBaseline( value ) && !isUndefined( value ) ) {
 		throw new TypeError( format( 'invalid assignment. `%s` must be one of the following: "%s". Value: `%s`.', prop.name, join( verticalBaselines(), '", "' ), value ) );
 	}
 	if ( value !== this[ prop.private ] ) {

lib/node_modules/@stdlib/plot/vega/axis/ctor/lib/main.js

@@ -723,8 +723,7 @@ setReadWriteAccessor( Axis.prototype, 'labelAngle', getLabelAngle, setLabelAngle
 *
 * @name labelBaseline
 * @memberof Axis.prototype
-* @type {string}
-* @default 'alphabetic'
+* @type {(string|void)}
 *
 * @example
 * var axis = new Axis({